Building an oldsmobile 350. Its going to have w31 heads with compression probably around 9:1. Roller rockers, full cam and valvetrain upgrade, full length headers, th350, performer rpm intake and holley 750. Power will be made in the lower rpm range for a street car. I have an msd 6al box. Is it worth the 3-400 bucks to get the pro billet ready to run msd distributor, or use my stock HEI distributor with the 6al, and blaster 3 coil... Thanks.